3 Easy Steps to Renewable Power 1.Plug in charger to included AC or car power adaptor. 2.Insert battery (batteries) 3.Select Mode: Charge, Discharge/charge, Test/charge Works with all NiCd & NiMH AA/AAA Rechargeable Batteries Automatically switches to trickle charge when charging is complete to ensure maximum battery capacity Automatically defaults to 500mA charge (the optimal setting for prolonging battery life) Overcharge detection to protect battery life Charges AA & AAA rechargeable batteries simultaneously Will not charge defective batteries When charging is complete, LCD shows capacity in %charged for each battery